{"product_id":"oem-lennox-fan-blower-control-board-81l75","title":"OEM Lennox Fan Blower Control Board — 81L75","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e81L75\u003c\/strong\u003e fan blower control board manages when and how your furnace's indoor blower runs. It handles heat and cool blower timing (on\/off delays), fan-speed selection, and the interface between the thermostat call and the blower motor, ensuring smooth, comfortable airflow and preventing cold or hot air drafts at startup and shutdown. It is built to Lennox factory specifications for a direct fit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms:\u003c\/strong\u003e the blower runs constantly or won't start, incorrect on\/off delays, the fan failing to switch between heat and cool speeds, intermittent operation, no airflow despite a thermostat call, or burnt spots and relay chatter on the board itself.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e Lennox blower timing profiles and relay ratings are tuned to your specific motor and system. An aftermarket board can mis-time the fan, drive the wrong speed, or overload relays, causing comfort issues and premature failure. The OEM \u003cstrong\u003e81L75\u003c\/strong\u003e ensures correct timing logic, connector compatibility, and dependable performance in your Lennox equipment.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081094218099,"sku":"LNX-81L75","price":129.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-control-board-fan-LNX-81L75.jpg?v=1783760757","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-fan-blower-control-board-81l75","provider":"National HVAC Parts","version":"1.0","type":"link"}